Revision as of 22:30, 6 July 2005
Image orientation with the shorter side in horizontal direction like usually used for portrait photography (hence the name).
Most image sensors and many film types have a longer and a shorter side. Shooting portrait gives a wider vertical and a narrower horizontal Field of View for a single shot. For a cylindrical panorama you need more shots for a given field of view if you shoot pportrait but you get a higher resolution.